a simple motion detection using webcam in Java

MotionDetector.java

import com.github.sarxos.webcam.Webcam;
import com.github.sarxos.webcam.WebcamMotionDetector;
import com.github.sarxos.webcam.WebcamMotionEvent;
import com.github.sarxos.webcam.WebcamMotionListener;
import com.leacox.process.FinalizedProcess;
import com.leacox.process.FinalizedProcessBuilder;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author anta40
 */
public class MotionDetector implements WebcamMotionListener {

    private final int INTERVAL = 3000;
    private String media_1, media_2 = "";
    private boolean detected = false;
    private boolean isPlaying = false;
    private FinalizedProcess proc_idle, proc_video;
    private FinalizedProcessBuilder pb1, pb2;
    
    public MotionDetector() throws IOException{
        WebcamMotionDetector detector = new WebcamMotionDetector(Webcam.getDefault());

        media_1 = "idle.mp4"; // media played in loop when idle
        media_2 = "advertisement.mp4" // media played when motion is detected
                
		// we use VLC for playing videos
		// assume that VLC is available in %PATH%
        pb1 = new FinalizedProcessBuilder("vlc", media_1, "--fullscreen" ,"--repeat");
        pb2 = new FinalizedProcessBuilder("vlc", media_2, "--fullscreen","vlc://quit");
        
		// play the 'idle' video
        proc_idle = pb1.start();
        
        // check movement per INTERVAL
        detector.setInterval(INTERVAL); 
        detector.addMotionListener(this);
		detector.start();
    }
   
       
    @Override
    public void motionDetected(WebcamMotionEvent wme) {
        System.out.println(">>> movement "+counter);
        ++counter;
		
		// Every time a motion is detected the video, kill the 'blank video' process, and start the 'advertisement video' process.
        try {
            proc_idle.close();
            proc_idle.destroy();
        } catch (IOException ex) {
			// Logger.getLogger(MotionDetector.class.getName()).log(Level.SEVERE, null, ex);
        }
        
        try {
            proc_video = pb2.start();
            
            try {
				// The duration of advertisement video is 64 seconds
				// set the timeout
                proc_video.waitFor(64000);
            } catch (InterruptedException ex) {
               // Logger.getLogger(MotionDetector.class.getName()).log(Level.SEVERE, null, ex);
            }
            finally {
				// assuming no motion is detected, kill the advertisement video, and play the blank video again
                proc_video.close();
                proc_video.destroy();
                proc_idle = pb1.start();
            }
        } catch (IOException ex) {
			//Logger.getLogger(MotionDetector.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    
    public static void main(String[] args) throws IOException {
        new MotionDetector();
		System.in.read(); 
    }
}